No, in those counties the dope growers grow for co-ops.
They grow in their backyard and barnyard and use the water hose to water.
In Sonoma County you can call the Sheriff out to tag up to 99 plants if you're willing to pay the tax.
It's possible to produce 30 pounds of clean bud per plant on the North Coast.
These guys produced 618 pounds off the Mendocino County limit of 25 plants:
https://www.youtube.com/watch?v=lkgmrQicXKw
I haven’t lived in Mendocino county in over 25 years, I used to really like it there, but I’ve seen quite a few articles that talk about water being diverted for grows. There are even satellite images showing the diversions and grows. Here is just one such article: http://qz.com/450604/marijuana-farms-are-drying-out-californias-rivers-to-the-distress-of-spawning-salmon/